I've been wanting an indoor-sized quad for a while, so when HK announced their new MicroQuad I sent off and got one. I was having some motor problems, and Andreas suggested it that the problem might not be in the motor or ESC, but in the HK controller board.
We swapped out the board with an APM2, and as you can see it flew quite nicely modulo some PID tuning. It's pretty neat that the APM2 is small enough to fit with no problem!
It's definitely the smallest APM-controlled thing I've seen -- any other tiny things out there?